Handle invitations inside Activity.

shell/view/ActivityHost.py

@@ -64,16 +64,13 @@ class ActivityHost:
     def get_model(self):
         return self._model
 
-    def invite(self, buddy):
-        pservice = presenceservice.get_instance()
-        activity = pservice.get_activity(self.get_id())
-        if activity is None:
-            logging.error('Invite failed, %s is unknown.' % self.get_id())
-        activity.invite(buddy.get_buddy(), '', self._invite_response_cb)
-
-    def _invite_response_cb(self, error):
-        if error:
-            logging.error('Invite failed: %s' % error)
+    def invite(self, buddy_model):
+        service = self._model.get_service()
+        if service:
+            buddy = buddy_model.get_buddy()
+            service.Invite(buddy.props.key)
+        else:
+            logging.error('Invite failed, activity service not ')
 
     def present(self):
         # wnck.Window.activate() expects a timestamp, but we don't